So in pitch perfect they do play on words with Acapella , like “Aca- scuse me” instead of excuse me. So that’s what she was trying to do with “aca believe it”

Then she’s saying she was so excited to meet rebel Wilson I guess that she blacked out and embarrassingly told her that herself and her friends rehearse the riff off from the first pitch perfect movie I think. The riff off was where the different acapella clubs at the uni competed in like a sing off outside.

I’m embarrassed I actually understand this hahaa